A psoas muscle exercise device is disclosed. The psoas muscle exercise device according to an embodiment of the present invention includes a seat portion on which a hip is seated; An elastic ball spaced apart in front of the seat and provided for lower body movement of the user; An elastic ball supporter on which the elastic ball is supported; Foot rests provided on the left and right sides of the elastic ball support and the user's foot is inserted; An air compressor connected through a connection tube connected to the elastic ball and provided for changing a volume inside the elastic ball; And it is provided on one side of the elastic ball support, and includes a mode adjuster provided for the user to selectively adjust the expansion and contraction state of the elastic ball.
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